The PowerShot S90 features Canon's precision 28mm Wide-angle Lens that allows you to shoot any scene from wide-angle to telephoto. It lets you capture more in every frame, so everyone fits in a family gathering shot. When it's time to take a closer look, a 3.8x optical zoom (35mm equivalent 28-105mm) greatly minimizes camera shake and maximizes the brilliance of every detail. The camera uses a USM (Ultrasonic Motor) for high-speed, quiet, energy-efficient lens movement with precise control. Focal length is conveniently indicated on the lens barrel.